写程序数据库设计会用到的数据库语句

--查询表结构
SELECT
--表名=case when a.colorder=1 then d.name else '' end,
--表说明=case when a.colorder=1 then isnull(f.value,'') else '' end,
字段名=a.name,
--标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
--主键=case when exists(SELECT 1 FROM sysobjects where xtype='PK' and name in (
--SELECT name FROM sysindexes WHERE indid in(
--SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid
--))) then '√' else '' end,
类型=b.name,
--占用字节数=a.length,
--长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'),
--小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
--允许空=case when a.isnullable=1 then '√'else '' end,
字段说明=isnull(g.[value],'')
FROM syscolumns a
left join systypes b on a.xusertype=b.xusertype
inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties'
left join syscomments e on a.cdefault=e.id
left join sys.extended_properties g on a.id=g.major_id and a.colid=g.minor_id
left join sys.extended_properties f on d.id=f.major_id and f.minor_id=0
where d.name='表名' --如果只查询指定表,加上此条件
order by a.id,a.colorder

 查询当前数据库有那些表

 SELECT ROW_NUMBER() OVER(ORDER BY sys.tables.name) AS ID,
  sys.tables.name as 表名,
  '' AS 表功能 
  FROM sys.tables